When braking on downgrades, the recommended action is to:

Downshifting while braking on downgrades is the recommended action because it enables better vehicle control and helps to manage speed effectively. When a driver downshifts, the engine speeds up, which allows the engine to slow the vehicle down through engine braking. This method reduces wear on the brake system and prevents the brakes from overheating, which can lead to brake fade—a condition where the brakes lose effectiveness due to excessive heat.

Using engine braking in conjunction with downshifting provides a more controlled descent, especially on steep grades. It allows the driver to maintain a safe speed without over-relying on the brake pedal, promoting safety and efficiency. This practice is particularly important in larger vehicles like trucks, where weight and momentum can significantly affect braking distance and control.